Only problem with that is it also takes out alkalinity according to Kevin, Also I think most people drip it into their skimmer. There should be more than enough info in the forums to figure it out though. I know The Reef Gallery will test your water for free. Aqua World will test it, think they might charge a couple bucks. I do not know if Elmer's will test for those parameters, I would be interested to know if anyone has that information.